Kiln for the continuous destructive distillation of organic material



W. K. LJUNGDAHL KILN FOR THE CONTINUOUS DESTRUCTIVE DISTILLATION OF ORGANIC MATERIAL I l//'///'a/71 A. Lyungdah/ 1922 2 Sheets-Sheet 1 Original Fil ed Sept. 21

N WWW Get. 19, 1926. 1,603,346

W. K. LJUNGDAHL KILN FOR THE CONTINUOUS DESTRUCTIVE DISTILLATION OF ORGANIC MATERIAL Original Filed Sept. 21, 1922 2 Sheets-Sheet 2 l a m 1:55:

STAIES WILLIAM K. LJ'UNGJDAHL, OF BEND, OREGON, ASSIGNOR TO ALBERT W. COOPER, F

PORTLAND, OREGON. I

mnn non. 'rnn oonrmuons nnsrnuo'rrvn DIs'rILLA'rroN or onennro MATERIAL.

Continuation of application Serial No. 589,652, filed September 21, 1922.

' 19, 1926. Serial No.'82,322.

My invention relates to kilns and retorts commonly employed in the destructive distillation of organic material and particularly those employed for carbonizing wood to 5 obtain charcoal and other products obtained in the process of destructive disti1lation.

My invention relates to the arrangement for the intake and outlet of the gas used as a heating medium and for properly distributing the same in the kiln or retort where continued operation is desired and in which the material to be treated is conveyed through a longitudinal horizontal or slightly inclined tunnel or retort in one direction while the How of the hot gas moves in theopposite direction.

This application is a continuation of my forfeited application, Serial No. 589,652, filed Sept. 21, 1922.

One of the difficulties in operating the kilns or retorts now in use is that the manner generally used .in introducing and exhausting the gases causes the gas to become mixed with air from the outside of the kiln or retort every time a conveyor containing the material to be treated is admitted or withdrawn and also the present method of introducing the gas does not distribute the gas uniformly throughout the kiln or retort so and when the gas is admitted too close to the end of the tunnel and unites with the air from the outside, it will easily become an explosive mixture, and may ignite and, therefore, cause a loss. Besides losing much of its eficiency by being mixed with the air, 'it will also vary in composition and will cause irregularity in condensing. ltn order to overcome these disadvantages in my invention, the intake and outlet openings for no the gas are located at a distancee from the inside or exchange door equal to the length of one car or conveyor or equal to the charge that is introduced or taken out from the kiln or retort. By this arrangement, the outside no manner of introducing the gases described in this specification, the gas will become equally difiused and distributed throughout the kiln or retort so as to uniformly char This application filed January tioned, in which the intake openings 11 and outlet openings 12 are located at points 2 and 3 which is the distance of the length of the car or conveyor 18 from the exchange or inlet and outlet doors 5 and v6. Fig. 2 is a plan view partly sectional which shows the intake and outlet openings and the connection with the condensers 14 and a regenerator 1.6, and the retort or kiln having sliding doors or gates 4:, 5, 6, 7 and 8 for intake and discharge of the material and 9 and 10 are exchange chambers at each end of the kiln or retort. 1F ig. 3 is a side elevation of a section of the kiln or retort showing the outlet exchange chamber and the channel for introducing the hot gases. Fig. 4 is a plan view of part ofthe kiln or retort, showing the connection between the regenerator 16 and the kiln or retort. Fig. 5 is a cross section of Fig. 3 at line A-B. The kiln or retort is of the same kind as used in the art and particularlydescribed in the patent to vAminofl, 748,457, but my method can he used for different types of kilns or retorts and is not confined to anv particular type, but the type'descr'ibed ls-the one most generally in use and most generally understood. Similar figures refer to similar parts throughout the several views of the drawan s.

ln operatin this kiln or retort, together with the con enser and regenerator plant, the heated gas used in treating the material flows in a direction opposite to the direction in which the conveyors carrying the material are moved or towards the outlet opening 12. This gas is used as a heating medium in charring the material during which process it becomes saturated with volatile products given ofi by the material treated. The gas now saturated in this manner leaves the tun nel or retort through the openings 12 which are located a distance from the door 5 equal to the length of the car or conveyor 18, carrying the material to be treated. The gas then passes through channel 13, whence it passes to a system of condensers 14, where the volatile products are separated from the gas which is then forced by a fan 15 to a regenerator 16, Where the gas is again heated and re-enters the kiln or retort through channel 17, at 2. In introducing the gas into the kiln it passes through a plurality of openings 11 in the bottom and the sides of the kiln or retort, these openings being spaced a substantial distance from the outlet exchange door 6 and the gas is thereafter withdrawn from the kiln or retort through a plurality of openings 12 located in the same relative position as the openings 11 which admits the gas to the kiln or retort, there after the gas passes through the condensers and the process of regenerating, charring and distilling is continued.

Having described my invention What-I wish to claim by Letters Patent is i 1. A kiln for use in the destructive distillation of organic material comprising an elongated chamber having openings at its opposite ends respectively for the introduction of material thereinto and its discharge therefrom, closures for said openings, said kiln having an inlet and an outlet port respectively adjacent its opposite ends for admitting and exhausting gas, the port adjacent the material inlet end being spaced from the closure for the material inlet opening at least substantially the length of a charge carrier.

A kiln for use in the destructive distillation of organic material comprising an elongated chamber having openings at its opposite endsrespectively for the introduction of material thereinto, and its discharge therefrom, closures for said openings, said kiln having an inlet and an outlet port respectively adjacent its opposite ends for admitting and exhausting gas, said ports being spaced at each end from the respective closures for the material inlet and outlet openings at least substantially the length of a charge carrier.

In testimony whereof, I have hereunto sc-t my hand.

WILLIAM K. LJUNGDAHL. 

